BTS power control

[robert]

Thank you.


On May 14, 2016, at 1:59 AM, Harald Welte <laforge at gnumonks.org> wrote:

> Hi Robert,
> 
> On Fri, May 13, 2016 at 07:19:14PM +0300, robert wrote:
>> In a talk presented by Chris Paget [1] he states that the BTS can tell
>> the MS to add a certain power amount to the signal that it has
>> measured.
> 
> That's not quite correct. The BTS can basically instruct a MS at any
> time to transmit any of the MS power levels supported by the specific MS
> power class in a given band.
> 
>> Is this feature implemented in OpenBSC ?
> 
> No, because it is fundamentally a feature of the BTS, not the BSC.  The
> power control loop is implemented inside the BTS.
> 
> OsmoBTS implements the power control loop.  Normally it is possible to
> override the MS power level with some static level via the RSL protocol
> betewen BSC and BTS, but we don't implement that part.
> 
> The easiest way to force a MS to transmit with higher power (if that's
> what you want) is to influence the power control loop inside the
> BTS, either by changing the code, or (on the osmo-bts-sysmo) you can
> change the 'target uplink signal level as received by the BTS' to
> something ridiculously high like -30 dBm, and then the loop will try to
> make sure to reach that level.  As that's virtually impossible, the MS
> will transmit at its maximum supported power level.
> 
> -- 
> - Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
> ============================================================================
> "Privacy in residential applications is a desirable marketing option."
>                                                  (ETSI EN 300 175-7 Ch. A6)